ARP issue on Cisco Switch

Hello everyone

We are having some strange arp issues in one vlan. Suddenly, some devices (not all of them) from vlan 1 are not able to ping vlan 2. Interface vlans are located on different switches and I have to manually clear arp in vlan 1 to make computers ping each other between vlans.

We have set arp timeout command in vlan 1 but it does not help until I manually clear it

Dear Neno,We have mst in

Dear Neno,

We have mst in place, but vlan 1 in our case is located on a root bridge and switch with vlan 2 is directly connected to it. I also suspected STP but this is happening with a root bridge and only for these 2 vlans with some computers. All other vlans are accessible

Update:Affected computers

Update:

Affected computers (for now these are just 2 mail servers located in vlan 1) are not able to ping any vlan on switch 2. Nothing is blocked by STP.

Mail server 1 is connected to Root bridge vlan 1, mail server is connected to another switch in vlan 1. Both servers are configured as a Cluster with Microsoft Exchange 2010. I suspect this could be a cluster issue, but not sure

This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
"Th...
view more

Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
1. commandoversms.tcl
2. PDF with instructions on how to load and use the .tcl file.